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| Chapter 12 Troubleshooting |
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| Problem |
| Check Point |
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| Machine operation abnormal | • | Is the XY carriage belt damaged? |
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| • | Are any set screws for the XY pulley loosened? | |
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| • | Are any set screws for the coupling of the XY pulse motor | |
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| loosened? |
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| Upper shaft locks at a certain point | • | Is the thread | |
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| in one cycle |
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| [Adjustment] |
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| Thread |
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| Upper case cover | Bolt |
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| Needle case |
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| Thread |
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| operating lever |
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| Loosen the hexagon socket head cap screw of the thread take- | |
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| up operating lever and adjust the | |
again |
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| Tighten it securely afterwards. |
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| • | Are the needle bar clamp and the top dead center stopper | ||
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| positioned correctly? |
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once |
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| Error display | • | Check the rotary hook of a machine head whose MENDING lamp | ||
points |
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| (green) is blinking to see if the thread is caught. | ||
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| [Adjustment] |
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these |
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| 1.Take out the thread tangled in the rotary hook race so that | |
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| the rotary hook can be rotated forcibly by manual operation. | ||
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Check |
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| 2.Check that the machine pulley is set to 100˚ of the scale, and | |
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| [Measures] |
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| press the END switch. |
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| 1.If the thread end is left too long or stitching is left loosened | |
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| before starting embroidering, the thread is caught in the | |
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| machine and operation stops. |
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| 2.When starting embroidering, hook the thread end on the | |
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| spring or hold it with a hand. |
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| 3.Leave thread of about 60 ~ 70 mm from the needle hole when | |
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| starting embroidering. |
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| • | Is thread tangled in the rotary hook? |
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| Clean the rotary hook. |
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| • | Conduct BC sensor test of the PC test mode. | |
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| If there is any failure, replace the lower shaft with a new one. | |
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| (Refer to "Replacing the Lower Shaft Module".) | |
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| Upper shaft pulley does not turn. | • | Is the presser foot lifted at a retract position when the power is | |
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| turned on? |
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| Lower the presser foot for the six machine heads using the lever. | |
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| Stitches cannot be made. | • | Is the needle attached properly? |
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| • | Is the timing of the needle and rotary hook correct? | |
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253 |
